williamson



(No Model.) 3 Sheets-Sheet 1.

A. D. WILLIAMSON.

DEVICE POR HEATING METAL RODS.

Patented May 24, 1892.

(No Model.) 3 Sheets-Sheet 2.

A. D. WILLIAMSON.

DEVICE POR HEATING METAL RODS.

Patented May 24, 1892.

3 Sheets-Sheet 3.

(No Model.)

A. D. WILLIAMSON. DEVICE EOE HEATING METAL Eens.

Patented May 24, 1892.

I I l l l l l J I l ll I I I I I l l l l I Il ...HHHHMHMHHHHHHH UNITEDSTATES PATENT OFFICE.

ALFRED D. VILLIAMSON, OF LONDON, ENGLAND, ASSIGNOR TO TIIE SIEMENSBROTHERS du COMPANY, LIMITED, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 475,651, dated May 24,1892.

Application filed October 21, 1891. Serial No. 409,419. (llo model.)Patented in England May 12, 1891, No. 8,152; in France October 12, 1891JNo. 216,679; in Belgium October' 12, 1891, No, 96,757; in SwitzerlandOctober l5, 1891,1To. 4,153; in Nor- Way October 19, 1891, No, 2,458,and in Austria-Hungary February 12, 1892, No. l19,965 and No. 81,6118.

T all whom t may concern:

Be it known that I, ALFRED DAVID IVIL- LIAMSON, a citizen of England,residing at 26 Alwyne Road, Oanonbury, London, in the county ofMiddlesex, England, have invented a new and useful Improvement inApparatus for Heating Metal Rods, tbc., (for which I have obtainedpatents in Great Britain, dated May 12, 1891, No. 8,152; in Switrozerland, dated October 15, 1891, No. 4,153;

in Norway, dated October 19, 1891, and February 17, 1892, No. 2,458; inFrance, dated October 12, 1891, No. 216,679; in Belgium, dated October12, 1891, No. 96,757, and in I5 Austria-Hungary, dated February 12,1892,

No. 49,965 and No. 811148,) of which the following is a specification.

This invention has forits object to provide a new and improved apparatusforlieating a zo metal rod, bar, or wire which is being ted through amachine for making nails, screws, key-blanks, or the like, to be heatedelec-trically to a high temperature in close proximity to the toolswhich operate on the heated 2 5 metal.

To accomplish this object my invention involves the features ofconstruction and the combination or arrangement of devices hereinafterdescribed and claimed, reference be- 30 ing made to the accompanyingdrawings, in

which- Figure 1 is a longitudinal sectional view of an apparatusembodying my invention. Fig. 2 is a transverse sectional view taken onthe line cc, Fig. 1. Fig. 3 is an end elevation,

and Fig. 4 is a plan view.

In the drawings, the letter A indicates a tube of carbon, which may be,as shown, externally circular and internally of a shape cor- 4oresponding with that of the metal rod or wire B that is to be heated. Itmay be made in one piece or built up of segments. Its ends areexternally coned to receive coned sleeves O C', of copper, gun-metal,brass, or other metal which is a good conductor ot' electricity, andwithin the ends are xed pieces D D', of slate, kaolin, or other suitablerefractory material, to act as guides for the rod B passing throughthem. The sleeves O C are fitted in frames E E', the one frame E beingstation- 5o ary and the other E free to slide along guidebolts F, whichare fixed to E and to a third stationary frame Springs G, attached toinsulators H, which may be of porcelain, draw the frame E toward E andthus cause the sleeves O O to closely embrace and make good electricalcontact with the ends ot the carbon tube A. A box made in two parts KK', of which K is attached to E and K to E, contains slag, wool, sand,or othersuitable re- 6o fractory material that is a bad conductor ofheat, completely surrounding and inclosing the tube A and covered by aremovable cover M. The various parts are insulated from each other bymica or other suitable non-conducting refractory material, as indicatedby the black parts of the drawings, so that when the frames E E areconnected, respectively, by conductors L L to the terminals of adynamo-electric machine or other source of elec- 7o tricity the electriccurrent, which may be of moderate tension, but is large in quantity,must pass exclusively through the carbon tube A, heating it to a hightemperature. The heat of the tube, radiated on the rod or wire B, raisesit to a high temperature, and as this rod or wire is advanced step bystep to be operated on by hammers or other tools it issues hot from thefront end of the tube at D, near which point the op- 8o erating-toolsmay be arranged. rlhe tube A, instead of being of carbon, may be ofother refractory material or compound of low electrical conductivity.The interior of the tube may be glazed to prevent it from wasting away,and, besides the bed of sand or the like which it occupies within theboxK K', itmay be sheathed with asbestus, slag, wool, or such likematerial. For the springs G may be substituted wire cords passing overpulleys 9o and attached to suitable weights, and instead of fitting theconed ends of the tube with coned sleeves pressed on them, as described,these ends might beheld in conducting-clamps of any known kind--such asare used,for cxample, in holding pieces ot` metal when they @meer arebeing electrically welded together. The interior of the tube might bymeans ot a pipe leading` into it laterally bekept supplied withhydrocarbon vapor, nitrogen, or other gas of neutral character, so as toavoid injurious oxidation of the metal rod or wire passing,` through thetube.

Having thus described the nature of my invention and in What manner thesame is to he performed, I claim- Iu an apparatus for electricallyheating a metal rod, bar, or wire, the combination of a stationary and amovable frame, interiorlyconed conductors carried by said stationary andmovable frames, a carbon tube provided with eXteriorly-coned ends toengage the interiorly-eoned sleeves carried by the stationary andmovable frames, and springs con- ALFRED D. lVILLIAMSON.

lVitnesses:

OLIVER IMRAY, Patent Agent, 2S Southampton Buildings, London, W. O'.

J No. P. M. MILLARD, Clerk to Messrs. Abel e@ Immg, Consulting Engineersand Patent Agents, 2 S Sou/,hampton Build/ings, London, W C'.

